Used primarily as a key intermediate in the synthesis of sulfa drugs and other fluorinated aromatic compounds. Its reactive fluorosulfonyl group enables efficient sulfonylation reactions, making it valuable in pharmaceutical development, particularly for creating novel antimicrobial and anti-inflammatory agents. It also serves in the preparation of specialty polymers and functional materials where strong electron-withdrawing groups enhance thermal and chemical stability. Due to its high reactivity, it is handled under controlled conditions for precise derivatization in research and industrial settings.